Bending beam headlamp with multi-filament bulb

Abstract: An automotive headlamp bulb provides the two light or three filament sources in a single bulb. One source may be used to generate a standard headlamp beam, while the second source may be used to generate an augmenting side beam in response to a turning signal. A similar third filament may provide an augmenting beam to the opposite side, or farther to the same side. The single bulb eliminates the need for a second bulb, or a second reflector in an advanced headlamp system with turning light augmentation. (end of abstract)

Bending beam headlamp with multi-filament bulb description/claims

Brief Patent Description

Full Patent Description

Patent Application Claims

CROSS-REFERENCE TO RELATED APPLICATIONS

not applicable

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to electric lamps and particularly to electric lamps. More particularly the invention is concerned with lamps with a plurality of enclosed filaments.

2. Description of the Related Art Including Information Disclosed Under 37 CFR 1.97 and 1.98

Advanced forward lighting headlamp systems (AFS) are being developed to light the road on the side a vehicle is turning to. The first AFS headlamp systems used one lamp and one reflector or projector lens. The beam control was achieved by rotating the entire lamp to the right or left with a stepper motor. This is a mechanically complex and expensive system. Alternative systems were devised using a first lamp to generate a forward beam and a second lamp to generate an augmenting side beam in response to a turning signal. By tuning between the two sources one can aim the beam. The two lamp AFS systems may use either or both two light sources, and two reflectors. The cost of the extra material for the lamps and the reflectors, the space and volume for the second lamp, and the additional labor in mounting, and aiming the duplicative systems makes the enhanced lighting system expensive.

BRIEF SUMMARY OF THE INVENTION

An incandescent lamp capsule may be made with an envelope having a light transmissive wall defining an enclosed volume, and a lamp axis. A first filament is positioned in the enclosed volume having a first filament axis. The first filament is oriented so the first filament axis is in an axial plane parallel with the lamp axis. A second filament is also positioned in the enclosed volume, defining a second filament axis. The second filament is oriented so the second filament axis is in the axial plane; and the second filament axis is not parallel to the first filament axis. A third filament is positioned in the enclosed volume, defining a third filament axis. The third filament is oriented so the third filament axis is in the axial plane with the first filament axis and the second filament axis. The third filament axis is not parallel to the first filament axis, and the third filament axis is not parallel to the second filament axis.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 shows a schematic view of an advanced forward lighting system.

FIG. 2 shows a schematic view of a preferred embodiment of a bending beam headlamp with a multi-filament bulb.

FIG. 3 shows a schematic view of a preferred embodiment of an alternative multi-filament arrangement for a bending beam headlamp.

FIG. 4 shows a detailed schematic view of an alternative embodiment of a multi-filament arrangement for a bending beam headlamp.

FIG. 5 shows a perspective view of an alternative automotive headlamp bulb with a multi-filament arrangement for a bending beam headlamp.

FIG. 6 shows a schematic view of an alternative embodiment of a multi-filament arrangement for a bending beam headlamp.

DETAILED DESCRIPTION OF THE INVENTION

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Previous Patent Application:
Vehicle headlamp
Next Patent Application:
Multi-axial light guide module
Industry Class:
Illumination

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